Automatic electric regulator.



BEST AVAELABLE COP No. 891,589. PATENTED JUNE 23, 1908.

. W. L. BLISS.

AUTOMATIC ELECTRIC REGULATOR.

APPLICATION FILED AUG. 24, 1904.

9 16 ood j ll\l INVENTOR.

WITZV'E ES.-

M ll/lilz'a/iz Z, [971193 BY T T 44 1; 7% yd ATTORNEY:-

translating devices. .Instead'of the field of the'motor havingwindings adapted to act differentially, thcarmaturethercof may have windings arlapterl'to act in-a similar manner. While the car is'atrest or is running at a low -s iced, the gcneratorwill be inoperative, and-then'thebattery will furnish the current for-operating the translating devices. -"Whei1' generator to de'vvlop-avoltage, forins'tance, eq'ualto that-{of the-battery, the automatic switch {will close and then the circuit will be cornletedfrom thetgenerator through the' supp y-main 3,:trans1ating devices 6 and the supply main 4, back tothe generator.

p While the" voltage devel p y thegenemtor that of the battery remain substantially equal, the generator and the battery will togather furnish the ,current fior operating the "translating devices, but when the voltage de'-'' veloped bythegen'erator exceeds that of the I battery, thefgenerator will furnish sufficient gcui'reht-to" operate the translating devices I .anda' also; charge the battery. The current gie'n delivered by the generator may flow ornithe generator through supply main 3,

thendividingly through the battery 5 and translatingdevices 6, and then after reuniti'n-the supply main 4, returns to the gen- "erator.

i A fter.-the automatic switch closes, the field winding 18 will be traversed \by current flow- .iiig'through'the'sup 1y circuit to thetrans- 'latin'g devices, and t e armature 16 and the 'fielii winding 17 'will receive current from the supply circuit through conductors 21 and 22. The iarmof the rheostat will then be in its initial osition against the stop 23, and current flow from the generator through the field 2, conductor 24, rheostat arm 15, and

conductor'22, back to the generator. 'Before thegenerator volta'ge rises above the battery voltage, the fieldwinding -17 will "have a greater magnetizing efiect than the 18and then the motor will tend to ofiicrate in such a direction that the arm of t e rheostat will remain against the sto 23,

which position all the resistance 0 the i rheostat will be removed from the field cir ycuit of the generator. voltage rises above the battery voltage as the 3 current from' the When the generator speed of the car increases, the current delivered by the generator will preci itately increase, since the battery will tien receive enerator. This increase in the current de ivered. by the enerator ,will cause the magnetizing efi'ect oi thc field winding 18 to 'reatly increase until eventually it will ro uce a greater magnetizing elfect than tie field w nding 17'. The motor will. thereupon have the direction in which it BEST taate w has been tending to operate reversed, and, consequently, it will commence to operate the rheostat to insert resistance intothe field circuit of the generator and thereby decrease .the energizing current of the'field of the gen- 70,

'olperate until afurther change takes-place '{i the car or train runs at sui licient speed for the t e output of the generator, and whenisucha change does occur,.fthe direction in .which i V said motor -ma operate will depend; upon, whether the V0 tage developed byfi the gene erator rises or falls. If the voltage'rises,,the

the voltage falls the"magnetizing etfectof the field winding 17 will become greater than the; --magnetizing effect of the field windinglfi, and,'consequently,. thev motor will operate the rheostat to decrease. the resistance in'the field circuit of the generator. When the s eed of the car decreases until the volta e eveloped by thegenerator falls belowtlie' voltage of the battery, the motor responding to the influence of the windin 17, will oper atethe rheostat to remove alf the resistance from'the field circuit of the'generator. The

automatic regulator operating in this way serves to confinethe output of the generator 6 within certain limits, notwithstanding the excessive\variation.; in the speed of the generator.

When the car or train travels at about twenty miles may then be riven at five hundred revolutions per niinute,. may 'develo equal to that of the battery whi stance, may be sixty-four volts.

a voltage ch, for in-' If the speed of the car shouldincrease to about 110 sixty miles per hour the generator would op- I crateat fifteen hundred revolutions per min:

ute. All other conditions remaining the same, the generator operating at this speed would develo about one .hundred and ninety-two vo ts, which would be excessive, but the field strength of the generator is decreased through the agency of the automatic regulator as the speed thereof rises and, therefore, the volta e developed by the generator remains within certain limits which are not excessive.

if the voltage developed by the enerator be allowed to increase toabout eig ity volts. at the maximum s 'eed of the car or train, it will havc rison su liciently to force the full charging current through the battery. Accordingly, the automatic regulator may permit such an incl-casein the voltage (levelopcd by the generator.

willcop j 1nto the field circuit ofthe generator, but if k per hour the generator, which c 7, BEST AVAILABLE cos:

Having described my .invention what I claim as new-and desire to secure by Letters Patent is: s

In a system of'electrical distribution, in I combination, a generator having a shunt field winding, a rheostatconnected in circuit with said shunt field winding, a main circuit extending from said enerator, a storage battery and translating devices connected to said main circuit in parallel, an automatic switch adapted to close said main circuit when the voltage of said generator rises above a certain point and to open said main circuit when the voltage of said generator falls'be- .5 low. a certain point, an electric motor for opmature winding of said motor being connect- 2 ed in series in a shunt circuit extending-across said main circuit switch and said generator.

In witness whereof, I have hereunto sub scribed my name in the presence of two witnesses.

WILLIAM LORD BLI'S-S. YVitnesses C. B. C. FOWLER, J. N. ROBERTSON.

between said automatic 

